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1 PROGRAM EXECUTION
1.5 Program Type
33
1
■If the same interrupt cause occurs while the interrupt program is being executed
• For I0 to I23 and I50 to I177
The interrupt cause that occured is memorized, and the interrupt program corresponding to the cause will be executed after
the running interrupt program finishes. Even if the same interrupt cause occurs multiple times, it will be memorized only once.
• For I28 to I31
The interrupt cause is memorized, and the interrupt program corresponding to the cause will be executed after the running
interrupt program finishes. If the same interrupt factor occurs multiple times, it will be memorized once but operation at the
second and later occurrences depends on setting of the fixed scan execution mode. (Page 23 Fixed scan execution
mode)
When "Execution Count Takes Priority" is enabled, the interrupt program corresponding to the memorized interrupt cause will
be executed after the running interrupt program finishes. When "Precede Fixed Scan" is enabled, the second and later
occurrences will not be memorized.
Setting the interrupt cycle
Set the interrupt cycle of interrupts I28 to I31 using the internal timer of the interrupt pointer.
Navigation window [Parameter] [FX5UCPU] [CPU Parameter] "Interrupt Settings" "Fixed Scan Interval
Setting"
Window
Displayed items
Item Description Setting range Default
Interrupt Setting from Internal
Timer
I28 Sets the execution interval of I28. 1 to 60000 ms (1 ms units) 100 ms
I29 Sets the execution interval of I29. 1 to 60000 ms (1 ms units) 40 ms
I30 Sets the execution interval of I30. 1 to 60000 ms (1 ms units) 20 ms
I31 Sets the execution interval of I31. 1 to 60000 ms (1 ms units) 10 ms
I0
Time
Main routine program
I0 interrupt program
I0 I0
The second and following interrupt causes, which
occur while an interruption executed, are not saved.
After the interruption being executed is completed,
the first interrupt program is executed.
I31
Time
Main routine program
I31 interrupt program
I31 I31
When "Execution Count
Takes Priority" is set
When "Precede Fixed Scan" is set
The second and following interruption causes, which occur while an interruption
is executed, operate according to the setting of the fixed scan execution mode.
The second interruption
is not executed.
The second interruption is executed.